Please give me the title of the novel! Newbie post

A long time ago, I read a novel in which the protagonist seems to have traveled through time in a museum!

The protagonist's name is a foreigner!
I remember one plot the most. In the academy trial, the protagonist was framed and his "buddy" helped the protagonist block an arrow!

This buddy came to study for the person he loved, but when he was about to be shot by an arrow, he confessed to the protagonist...
The protagonist kissed him He took one breath and left!

There is another scene, the finale!
The protagonist helped the heroine block a blow from BOOS and was about to die. The heroine committed suicide on the spot and revealed that she was a man!

This was recommended to me by three writers!
At that time, I asked for some fantasy novels without YY and harem, but I didn't leave a bookmark, and I can't find it now.

So I wanted to ask if you have any impressions (it seems to be about "fans")! I would like to ask for a few copies by the way!
Thank you!